I will play devil's advocate here.... It think BMW M made the wrong trade off here. I recognize a flat torque curve is good engineering and makes driving the car on a daily basis a good thing but Ms should have all the torque in the last 2000-3000 RPM, screw the rest of the power band.

The last 2000-3000 rpm is where all the action happens. The S65's torque falls off precisely where you want it to be peaking.